William l



UNITED STATES WILLIAM L.

PARMELEE, OF ANSONIA, CONNECTICUT, ASSIGNOR TO THE DERBY BIT COMPANY, OF SAME PLACE.

BIT-STOCK.

SPECIFICATION forming part 0f Letters Patent No. 281,920, dated July 24, 1883.

Application tiled May 7, 1883.

To aZZ whom, it may concern,.-

Be it known that I, WILLIAI\I L. PARMELEE,

a citizen of the United States, residing at Ansonia, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Bit-Stocks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to bit-stocks of that class which are adapted to receive and hold bits of dierent kinds and sizes; and the novelty consists in the construction, arrangement, and adaptation of parts, as will be more fully hereinafter set forth, and specifically pointed out in the claims.

The object in general of the invention may be briey said to be to provide abraee or stock which shall be uncomplicated in construction and inexpensive in manufacture, which shall be efficient, simple, an d reliable in service, and which shall allow the operator, in case of an obstruction to the revolutions of the crank portion, to disengage the brace, turn it back, and again readily engage the bit; and these ends I accomplish by the mechanism fully illustrated in the accompanying drawings, which form a part .of this specification, and in which- Figure l is an elevation of my invention broken away to show some of the internal (No model.)

inherent in the material. This clamp portion 5o operates loosely in a barrel, B, the jaws A being held constantly apart by the inherent spring action before referred to, except when such action is overcome by the part being drawn up into the barrel by the nut a', the in 55 clined outer surfaces of the jaws impinging upon the edges of the mouth b to force them together and upon the shank of the bit m. The barrel B has a cylindrical portion, B,

which is of less diameter than the body of the 6o having a longitudinal slot, b3, through which 7o the lug c passes when the barrel and brace are put together, as shown in Fig. l. The parts B B3 are of similar diameter, and have a uniform bearing upon the interior surface of the tube C', and this tubular part has aplay 7 5 upon the barrel equal to the difference between the length of the tube and the distance between the annular shoulder b* and the end of the barrel upon which the nut a. has its bearings, which amount of vertical play is 8o sufficient to allow the operator to throw the lug c into one of the recesses, b, or into the annular recess B, as occasion may require.

c is the revolving loose bulb.

The operation of the device, from the fore- 8 5 going description, will be readily understood.

In details of construction modifications may be made without departing from the principle or sacrificing the advantages of my invention.

' Having thus fully described the invention, 9o

what I claim as new is- 1. In a brace having a removable independent barrel, a pair of spring clampingjaws formed in one piece with a threaded shank,

and adapted to serve with said barrel and an 95 adjusting or clamping nut, as set forth.

2. In a brace, a clamp-holding barrel combined with a brace-frame, havinga socket, C',

Suc- 65 2 asumo I0 set forth.

4. The brace-frame C C, having lng c', Coinbined with the barrel having recesses b', ann nnlar recess B2, and slot b3, and with the springclanip A and nut a, as and for the purposes .set forth.

In testimony whereof I ax my signaturein presence of two witnesses.

VILLIAM L. PARMELEE.

'Vitn esses:

Josnrn FoRRnsr, H. J. BERNHARD. 

